# Two valence electrons occupy the outer energy level of the element strontium. If strontium forms an ion, what will be its likely charge?

May 21, 2018

+2

#### Explanation:

Strontium will lose the two outer valance electrons to form a stable noble gas electron structure. As electrons are negative losing two negative electrons will leave Strontium with a +2 charge.

May 21, 2018

Would it not be $S {r}^{2 +}$?

#### Explanation:

You gots a Group 2 metal, an alkaline earth, and these with TWO valence electrons, typically form ${M}^{2 +}$ ions upon oxidation...

$S r \rightarrow S {r}^{2 +} + 2 {e}^{-}$

We could write the entire electronic configuration of strontium metal as $Z = 38$...

${\underbrace{1 {s}^{2} 2 {s}^{2} 2 {p}^{6} 3 {s}^{2} 3 {p}^{6} 4 {s}^{2} 3 {d}^{10} 4 {p}^{6} 5 {s}^{2}}}_{\text{electronic configuration of strontium metal}}$

And upon oxidation....

${\underbrace{1 {s}^{2} 2 {s}^{2} 2 {p}^{6} 3 {s}^{2} 3 {p}^{6} 4 {s}^{2} 3 {d}^{10} 4 {p}^{6}}}_{\text{electronic configuration of strontium dication}}$

The valence electrons are the $s$ electrons...and these can be ionized...